"""
    Flowblade Movie Editor is a nonlinear video editor.
    Copyright 2012 Janne Liljeblad.

    This file is part of Flowblade Movie Editor <https://github.com/jliljebl/flowblade/>.

    Flowblade Movie Editor is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Flowblade Movie Editor is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Flowblade Movie Editor. If not, see <http://www.gnu.org/licenses/>.
"""

"""
Application module.

Handles application initialization, shutdown, opening projects, autosave and changing
sequences.
"""
import faulthandler

try:
    import pgi
    pgi.install_as_gi()
except ImportError:
    pass
    
import gi

from gi.repository import GLib
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk
from gi.repository import Gdk
from gi.repository import Gio

import locale
try:
    import mlt7 as mlt
except:
    import mlt
    
import hashlib
import os
import sys
import time

import animatedvalue
import appconsts
import audiomonitoring
import audiowaveformrenderer
import batchrendering
import boxmove
import callbackbridge
import clipeffectseditor
import clipmenuaction
import compositeeditor
import compositormodes
import containeractions
import databridge
import dialogs
import dialogutils
import dnd
import diskcachemanagement
import edit
import editevent
import editorlayout
import editorpersistance
import editorstate
import editorwindow
import glassbuttons
import gmic
import gtkevents
import gui
import guicomponents
import guipopoverclip
import jobs
import keyevents
import keyframeeditor
import keyframeeditcanvas
import keygtkactions
import kftoolmode
import medialinker
import medialog
import mediaplugin
import mltenv
import mltfilters
import mltplayer
import mltprofiles
import mlttransitions
import modesetting
import movemodes
import multitrimmode
import persistance
import positionbar
import processutils
import projectaction
import projectdata
import projectdatavault
import projectdatavaultgui
import projectinfogui
import propertyeditorbuilder
import render
import renderconsumer
import rendergputest
import respaths
import resync
import rotomask
import scripttool
import sequence
import shortcuts
import shortcutsquickeffects
import snapping
import targetactions
import threading
import titler
import tlinewidgets
import toolsintegration
import trimmodes
import translations
import undo
import updater
import usbhid
import usbhiddrivers
import userfolders
import utils
import utilsgtk
import workflow

_app = None
_window = None

_app_init_complete = False

AUTOSAVE_DIR = appconsts.AUTOSAVE_DIR
AUTOSAVE_FILE = "autosave/autosave"
instance_autosave_id_str = None
PID_FILE = "flowbladepidfile"
BATCH_DIR = "batchrender/"
autosave_timeout_id = -1
disk_cache_timeout_id = -1
loaded_autosave_file = None
recovery_in_progress = False

exit_timeout_id = -1
window_resize_id = -1
window_state_id = -1 # TODO: get rid of this
resize_timeout_id = -1
monitor_resize_id = -1

_log_file = None

assoc_file_path = None
assoc_timeout_id = None


def main(root_path):
    """
    Called at application start.
    Initializes application with a default project.
    """
    # DEBUG: Direct output to log file if log file set.
    if _log_file != None:
        log_print_output_to_file()

    set_quiet_if_requested()

    print("Application version: " + editorstate.appversion)

    # Print OS, Python version and GTK+ version.
    try:
        os_release_file = open("/etc/os-release","r")
        os_text = os_release_file.read()
        s_index = os_text.find("PRETTY_NAME=")
        e_index = os_text.find("\n", s_index)
        print("OS: " + os_text[s_index + 13:e_index - 1])
    except:
        pass

    print("Python", sys.version)

    gtk_version = "%s.%s.%s" % (Gtk.get_major_version(), Gtk.get_minor_version(), Gtk.get_micro_version())
    print("GTK+ version:", gtk_version)
    editorstate.gtk_version = gtk_version
    try:
        editorstate.mlt_version = mlt.LIBMLT_VERSION
    except:
        editorstate.mlt_version = "0.0.99" # magic string for "not found"

    # Create user folders if needed.
    userfolders.init()

    # Set paths.
    respaths.set_paths(root_path)

    # Load editor prefs and list of recent projects.
    editorpersistance.load()

    # Force custom theme. NOTE: See if possible to use Adwaita Dark after GTK 4 port.
    editorpersistance.prefs.theme = appconsts.FLOWBLADE_THEME_NEUTRAL

    editorpersistance.save()

    # Create app.
    app = FlowbladeApplication()
    global _app
    _app = app
    app.run(None)


class FlowbladeApplication(Gtk.Application):

    def __init__(self, *args, **kwargs):
        Gtk.Application.__init__(self, application_id=None,
                                 flags=Gio.ApplicationFlags.FLAGS_NONE)
        self.connect("activate", self.on_activate)

    def on_activate(self, data=None):
        faulthandler.enable()
        
        # Init translations module with translations data.
        translations.init_languages()
        translations.load_filters_translations()
        mlttransitions.init_module()

        # Keyboard shortcuts.
        shortcuts.update_custom_shortcuts()
        shortcuts.load_shortcut_files()
        shortcuts.load_shortcuts()
        shortcutsquickeffects.load_shortcuts()

        # We have translations in data structs and need some initing.
        animatedvalue.init()

        # The test for len != 4 is to make sure that if we change the number of values below the prefs are reset to the correct list
        # So when we add or remove a value, make sure we also change the len test
        # Only use positive numbers.
        if( not editorpersistance.prefs.AUTO_SAVE_OPTS or len(editorpersistance.prefs.AUTO_SAVE_OPTS) != 4):
            print("Initializing Auto Save Options")
            editorpersistance.prefs.AUTO_SAVE_OPTS = ((0, _("No Autosave")),(1, _("1 min")),(2, _("2 min")),(5, _("5 min")))

        # We need respaths and translations data available so we need to do init in a function.
        workflow.init_data()

        # Handle userfolders init error and quit.
        if userfolders.get_init_error() != None:
            _xdg_error_exit(userfolders.get_init_error())
            return

        # MLT 7.0 or higher required.
        if editorstate.mlt_version_is_greater_correct("6.99.99") == False:
            _too_low_mlt_version_exit()
            return

        # Apply custom themes.
        gui.apply_theme()

        try:
            Gtk.Settings.get_default().set_property("gtk-application-prefer-dark-theme", True)
        except:
            print("SETTING DARK THEME PREFERENCE FAILED, SYSTEM DARK THEME NOT AVAILABLE!")

        # Load drag'n'drop images.
        dnd.init()

        # Save screen size data and modify rendering based on screen size/s and number of monitors. 
        scr_w, scr_h = _set_screen_size_data()
        _set_draw_params()

        # Refuse to run on too small screen.
        if scr_w < 1151 or scr_h < 767:
            _too_small_screen_exit()
            return

        # Init MLT framework
        repo = mlt.Factory().init()
        processutils.prepare_mlt_repo(repo)

        # Set numeric locale to use "." as radix, MLT initializes this to OS locale and this causes bugs.
        locale.setlocale(locale.LC_NUMERIC, 'C')

        # Check for codecs and formats on the system exit if detection failed.
        mltenv.check_available_features(repo)
        if mltenv.environment_detection_success == False:
            _failed_environment_exit()
            return
            
        renderconsumer.load_render_profiles()

        # Load filter and compositor descriptions from xml files.
        mltfilters.load_filters_xml(mltenv.services)
        mltfilters.set_icons(gui.get_default_filter_icon(), \
                             gui.get_filter_group_icons(gui.get_default_filter_icon()))
        mlttransitions.load_compositors_xml(mltenv.transitions)
        
        # Replace some services if better replacements available.
        mltfilters.replace_services(mltenv.services)

        # Create list of available mlt profiles.
        mltprofiles.load_profile_list()

        # We need to test which GPU render options work after profiles are inited because
        # we do the test by doing test renders.
        rendergputest.test_gpu_rendering_options(render.update_encoding_selector)
            
        # Save assoc file path if found in arguments.
        global assoc_file_path
        assoc_file_path = get_assoc_file_path()
            
        # There is always a project open, so at startup we create a default project.
        # Set default project as the project being edited.
        editorstate.project = projectdata.get_default_project()
        
        # Init projectdatavault, we need it now to create project data folders.
        projectdatavault.init()
        vault_folder = projectdatavault.get_active_vault_folder()
        editorstate.project.create_vault_folder_data(vault_folder)
        projectdatavault.create_project_data_folders()

        # Check that we are operating with unchanged xdg data dir and give info if not.
        xdg_data_dir = os.path.join(GLib.get_user_data_dir(), "flowblade")
        vaults_obj = projectdatavault.get_vaults_object()
        if hasattr(vaults_obj, "last_xdg_data_dir") == False:
            vaults_obj.last_xdg_data_dir = xdg_data_dir
            vaults_obj.save()
        if vaults_obj.last_xdg_data_dir != xdg_data_dir:
            vaults_obj.last_xdg_data_dir = xdg_data_dir
            vaults_obj.save()
            GLib.timeout_add(1000, xdg_data_dir_changed_dialog)

        check_crash = True

        # Audiomonitoring being available needs to be known before GUI creation.
        audiomonitoring.init(editorstate.project.profile)

        # Set trim view mode to current default value.
        editorstate.show_trim_view = editorpersistance.prefs.trim_view_default

        # Check for tools and init tools integration.
        gmic.test_availablity()
        toolsintegration.init()

        # Media Plugins a.k.a Generators.
        mediaplugin.init()

        # Create player object.
        create_player()

        # Create main window and make widgeta available from gui.py.
        create_gui()

        # These need widget objects to exist to build ata structures
        keygtkactions.init()

        # Inits widgets with project data.
        init_project_gui()

        # Inits widgets with current sequence data.
        init_sequence_gui()

        # Set SDL consumer version to be used.
        #if editorstate.mlt_version_is_greater_correct("7.28.0") or editorstate.force_sdl2 == True \
        #    or editorstate.app_running_from == editorstate.RUNNING_FROM_FLATPAK:
        if editorstate.force_sdl2 == True:
            mltplayer.set_sdl_consumer_version(mltplayer.SDL_2)
        else:
            mltplayer.set_sdl_consumer_version(mltplayer.SDL_1)

        # Launch player if we're using SDL 1 consumer.
        if mltplayer.get_sdl_consumer_version() == mltplayer.SDL_1:
            launch_player()

        # Editor and modules need some more initializing.
        init_editor_state()

        # Save Gtk.Window reference.
        global _window
        _window = gui.editor_window.window
        
        # Tracks need to be re-centered if window is resized and sdl2 consumer resized if
        # monitor widget resized.
        # Connect listener for this now that the tline panel size allocation is sure to be available.
        global window_resize_id, window_state_id, monitor_resize_id
        window_resize_id = gui.editor_window.window.connect("size-allocate", lambda w, e:updater.window_resized())
        if mltplayer.get_sdl_consumer_version() == mltplayer.SDL_1: # Delete when everyone is on mlt 7.30 or moving to Gtk4.
            window_state_id = gui.editor_window.window.connect("window-state-event", lambda w, e:updater.window_resized())
        monitor_resize_id = gui.tline_display.connect("size-allocate", lambda w, e:tline_display_resized())

        # Get existing autosave files
        autosave_files = get_autosave_files()

        appconsts.SAVEFILE_VERSION = projectdata.SAVEFILE_VERSION # THIS IS A QUESTIONABLE IDEA TO SIMPLIFY IMPORTS, NOT DRY. WHEN DOING TOOLS THAT RUN IN ANOTHER PROCESSES AND SAVE PROJECTS, THIS LINE NEEDS TO BE THERE ALSO.

        # Every running instance has unique autosave file which is deleted at exit
        set_instance_autosave_id()

        # Existence of autosave file hints that program was exited abnormally.
        if check_crash == True and len(autosave_files) > 0:
            global recovery_in_progress
            if len(autosave_files) == 1:
                recovery_in_progress = True
                GLib.timeout_add(10, autosave_recovery_dialog)
            else:
                recovery_in_progress = True
                GLib.timeout_add(10, autosaves_many_recovery_dialog)
        else:
            start_autosave()

        projectaction.clear_changed_since_last_save_flags()
        
        # We prefer to monkeypatch some callbacks into some modules, usually to
        # maintain a simpler and/or non-circular import structure.
        monkeypatch_callbacks()

        # File in assoc_file_path is opened after very short delay.
        if not(check_crash == True and len(autosave_files) > 0):
            if assoc_file_path != None:
                print("Launch assoc file:", assoc_file_path)
                global assoc_timeout_id
                assoc_timeout_id = GLib.timeout_add(10, open_assoc_file)
        
        # In PositionNumericalEntries we are using Gtk.Entry objects in a way that works for us nicely, but is somehow "error" for Gtk, so we just kill this.
        Gtk.Settings.get_default().set_property("gtk-error-bell", False)
        
        global disk_cache_timeout_id
        disk_cache_timeout_id = GLib.timeout_add(2500, check_disk_cache_size)

        editorstate.app = self

        # Connect to USB HID device (if enabled)
        start_usb_hid_input()

        # Used for imports refactoring.
        for arg in sys.argv:
            if arg == "--launchall":
                GLib.timeout_add(1000, _launch_all)

        global _app_init_complete
        _app_init_complete = True

        # Launch SDL 2 player now that data and gui exist if using that.
        if mltplayer.get_sdl_consumer_version() == mltplayer.SDL_2:
            GLib.idle_add(_create_sdl_2_consumer)

        self.add_window(_window)
        if editorpersistance.prefs.global_layout != appconsts.SINGLE_WINDOW:
            self.add_window(gui.editor_window.window2)

# --------------------------------------- display
def _create_sdl_2_consumer():
    launch_player()

def tline_display_resized():
    editorstate.PLAYER().display_resized()

# ----------------------------------- callback setting
def monkeypatch_callbacks():

    callbackbridge.app_open_project = open_project
    callbackbridge.app_new_project = new_project
    callbackbridge.app_stop_autosave = stop_autosave
    callbackbridge.app_start_autosave = start_autosave
    callbackbridge.app_change_current_sequence = change_current_sequence
    callbackbridge.app_shutdown = shutdown
    callbackbridge.boxmove_get_selection_data = boxmove.get_selection_data
    callbackbridge.clipeffectseditor_refresh_clip = clipeffectseditor.refresh_clip
    callbackbridge.clipeffectseditor_update_kfeditors_sliders = clipeffectseditor.update_kfeditors_sliders
    callbackbridge.clipeffectseditor_clip_is_being_edited = clipeffectseditor.clip_is_being_edited
    callbackbridge.clipmenuaction_display_clip_menu = clipmenuaction.display_clip_menu
    callbackbridge.clipmenuaction_compositor_menu_item_activated = clipmenuaction.compositor_menu_item_activated
    callbackbridge.clipmenuaction_get_popover_clip_data = clipmenuaction.get_popover_clip_data
    callbackbridge.clipmenuaction_set_compositor_data = clipmenuaction.set_compositor_data
    callbackbridge.editevent_tline_range_item_drop = editevent.tline_range_item_drop
    callbackbridge.compositeeditor_get_compositor = compositeeditor.get_compositor
    callbackbridge.compositormodes_get_snapped_x = compositormodes.get_snapped_x
    callbackbridge.compositormodes_get_pointer_context = compositormodes.get_pointer_context
    callbackbridge.dialogs_show_cyclic_error = dialogs.show_cyclic_error 
    callbackbridge.editevent_do_multiple_clip_insert = editevent.do_multiple_clip_insert
    callbackbridge.medialog_clips_drop = medialog.clips_drop
    callbackbridge.mediaplugin_get_clip = mediaplugin.get_clip
    callbackbridge.mediaplugin_set_plugin_to_be_edited = mediaplugin.set_plugin_to_be_edited
    callbackbridge.modesetting_set_default_edit_mode = modesetting.set_default_edit_mode
    callbackbridge.modesetting_kftool_mode_from_kf_editor = modesetting.kftool_mode_from_kf_editor
    callbackbridge.movemodes_select_clip = movemodes.select_clip
    callbackbridge.movemodes_select_from_box_selection = movemodes.select_from_box_selection
    callbackbridge.projectaction_open_rendered_file = projectaction.open_rendered_file
    callbackbridge.projectaction_open_file_names = projectaction.open_file_names
    callbackbridge.rotomask_show_rotomask = rotomask.show_rotomask
    callbackbridge.targetactions_get_handler_by_name = targetactions.get_handler_by_name
    callbackbridge.targetactions_move_player_position = targetactions.move_player_position
    callbackbridge.targetactions_variable_speed_playback = targetactions.variable_speed_playback
    callbackbridge.trimmodes_set_no_edit_trim_mode = trimmodes.set_no_edit_trim_mode
    callbackbridge.updater_display_sequence_in_monitor = updater.display_sequence_in_monitor
    callbackbridge.updater_set_and_display_monitor_media_file = updater.set_and_display_monitor_media_file
    callbackbridge.updater_repaint_tline = updater.repaint_tline
    
    databridge.app_get_save_time_msg = get_save_time_msg
    databridge.mltprofiles_get_profile_name_for_index = mltprofiles.get_profile_name_for_index
    databridge.tlinewidgets_get_frame = tlinewidgets.get_frame
    databridge.tlinewidgets_get_frame_x = tlinewidgets._get_frame_x
    databridge.tlinewidgets_get_track = tlinewidgets.get_track
    databridge.trimmodes_submode_is_keyb_edit_on = trimmodes.submode_is_keyb_edit_on
    databridge.snapping_get_snapping_on = snapping.get_snapping_on
    databridge.usbhid_get_usb_hid_device_config_metadata_list = usbhid.get_usb_hid_device_config_metadata_list
    databridge.glass_buttons_default_focus_group_has_focus = glassbuttons.default_focus_group_has_focus

    # Set callbacks for undo/redo ops.
    undo.set_post_undo_redo_callback(modesetting.set_post_undo_redo_edit_mode)
    undo.repaint_tline = updater.repaint_tline



# ---------------------------------- program, sequence and project init
def get_assoc_file_path():
    """
    Check if were opening app with file association launch from Gnome
    """
    arg_str = ""
    for arg in sys.argv:
        ext_index = arg.find(".flb")
        if ext_index != -1:
            arg_str = arg
    
    if len(arg_str) == 0:
        return None
    else:
        return arg_str

def open_assoc_file():
    GLib.source_remove(assoc_timeout_id)
    projectaction.actually_load_project(assoc_file_path, block_recent_files=False)

def set_quiet_if_requested():
    for arg in sys.argv:
        if arg == "--quiet":
            global _log_file
            _log_file = "/dev/null"
            log_print_output_to_file()
            
def create_gui():
    """
    Called at app start to create gui objects and handles for them.
    """
    tlinewidgets.load_icons_and_set_colors()
    kftoolmode.load_icons()

    updater.set_clip_edit_mode_callback = modesetting.set_clip_monitor_edit_mode
    updater.load_icons()

    # Make layout data available.
    editorlayout.init_layout_data()

    # Create window and all child components.
    editor_window = editorwindow.EditorWindow()
    
    # Make references to various gui components available via gui module.
    gui.capture_references(editor_window)

    # Unused frames take 3 pixels so hide those.
    editorlayout.set_positions_frames_visibility()
        
    # All widgets are now realized and references captured so can find out theme colors.
    # TODO: Delete this code, we are not detecting anything anymore and theme colors not
    # variable anymore.
    gui.set_theme_colors()
    tlinewidgets.set_dark_bg_color()
    gui.pos_bar.set_dark_bg_color()
    
    # Connect window global key listener.
    #gui.global_key_controller_1 = gtkevents.KeyPressEventAdapter(gui.editor_window.window, keyevents.key_down, user_data=None, capture=True)
    gui.editor_window.window.connect("key-press-event", keyevents.key_down)
    if editorpersistance.prefs.global_layout != appconsts.SINGLE_WINDOW:
        gui.editor_window.window2.connect("key-press-event", keyevents.key_down)
    
    # Give undo a reference to uimanager for menuitem state changes.
    undo.set_menu_items(gui.editor_window.uimanager)
    
    updater.display_sequence_in_monitor()

def create_player():
    """
    Creates mlt player object
    """
    # Create player and make available from editorstate module.
    editorstate.player = mltplayer.Player(editorstate.project.profile)
    editorstate.player.set_tracktor_producer(editorstate.current_sequence().tractor)

def launch_player():
    # Create SDL output consumer.
    editorstate.player.set_sdl_xwindow(gui.tline_display)
    editorstate.player.create_sdl_consumer()

    # Display current sequence tractor.
    updater.display_sequence_in_monitor()
    
    # Connect buttons to player methods.
    gui.editor_window.connect_player(editorstate.player)
    
    # Start player.
    editorstate.player.connect_and_start()

def init_project_gui():
    """
    Called after project load to initialize interface
    """
    # Display media files in "Media" tab .
    gui.media_list_view.fill_data_model()
    try: # Fails if current bin is empty
        selection = gui.media_list_view.treeview.get_selection()
        selection.select_path("0")
    except Exception:
        pass

    gui.bin_list_view.fill_data_model()
    selection = gui.bin_list_view.treeview.get_selection()
    selection.select_path("0")
    gui.editor_window.bin_info.display_bin_info()

    gui.sequence_list_view.fill_data_model()
    selection = gui.sequence_list_view.treeview.get_selection()
    selected_index = editorstate.project.sequences.index(editorstate.current_sequence())
    selection.select_path(str(selected_index))
  
    # Display logged ranges in "Range Log" tab.
    medialog.update_group_select_for_load()
    medialog.update_media_log_view()

    render.set_default_values_for_widgets(True)
    gui.tline_left_corner.update_gui()
    projectinfogui.update_project_info()

    titler.reset_titler()
    
    # Set render folder selector to last render if prefs require.
    folder_path = editorstate.PROJECT().get_last_render_folder()
    if folder_path != None and editorpersistance.prefs.remember_last_render_dir == True:
        gui.render_out_folder.set_current_folder(folder_path)

def init_sequence_gui():
    """
    Called after project load or changing current sequence 
    to initialize interface.
    """
    # Set correct compositing mode menu item selected.
    gui.editor_window.init_compositing_mode_menu()
    gui.comp_mode_launcher.set_pixbuf(editorstate.get_compositing_mode())

    # Set initial timeline scale draw params.
    editorstate.current_sequence().update_length()

    updater.update_pix_per_frame_full_view()
    updater.init_tline_scale()
    updater.repaint_tline()

def init_editor_state():
    """
    Called after project load or changing current sequence 
    to initialize editor state.
    """
    render.fill_out_profile_widgets()

    gui.media_view_filter_selector.set_pixbuf(editorstate.media_view_filter)

    gui.editor_window.window.set_title(editorstate.project.name + " - Flowblade")
    gui.editor_window.uimanager.get_widget("/MenuBar/FileMenu/Save").set_sensitive(False)
    gui.editor_window.uimanager.get_widget("/MenuBar/EditMenu/Undo").set_sensitive(False)
    gui.editor_window.uimanager.get_widget("/MenuBar/EditMenu/Redo").set_sensitive(False)

    # Center tracks vertical display and init some listeners to
    # new value and repaint tracks column.
    tlinewidgets.set_ref_line_y(gui.tline_canvas.widget.get_allocation())
    gui.tline_column.init_listeners()
    gui.tline_column.widget.queue_draw()

    # Clear editors.
    clipeffectseditor.clear_clip()
    compositeeditor.clear_compositor()

    # Show first pages on notebooks.
    try:
        gui.editor_window.notebook.set_current_page(0)
    except:
        pass

    # Clear clip selection.
    movemodes.clear_selection_values()

    # Set initial edit mode.
    modesetting.set_default_edit_mode()
    
    # Create array needed to update compositors after all edits.
    editorstate.current_sequence().restack_compositors()

    undo.clear_undos()

    # Enable edit action GUI updates.
    edit.do_gui_update = True

def new_project(profile_index, v_tracks, a_tracks):
    sequence.VIDEO_TRACKS_COUNT = v_tracks
    sequence.AUDIO_TRACKS_COUNT = a_tracks
    profile = mltprofiles.get_profile_for_index(profile_index)
    new_project = projectdata.Project(profile)
    open_project(new_project)

def open_project(new_project):
    stop_autosave()
    gui.editor_window.window.handler_block(window_resize_id)
    if mltplayer.get_sdl_consumer_version() == mltplayer.SDL_1: # TODO: get rid of this
        gui.editor_window.window.handler_block(window_state_id)

    audiomonitoring.close_audio_monitor()
    audiowaveformrenderer.clear_cache()

    editorstate.project = new_project
    editorstate.media_view_filter = appconsts.SHOW_ALL_FILES
    
    # Inits widgets with project data.
    init_project_gui()
    
    # Inits widgets with current sequence data.
    init_sequence_gui()

    # Set and display current sequence tractor.
    display_current_sequence()
    
    # Editor and modules need some more initializing.
    init_editor_state()
    
    # For save time message on close.
    projectaction.save_time = None
    
    # Delete autosave file after it has been loaded.
    global loaded_autosave_file
    if loaded_autosave_file != None:
        print("Deleting", loaded_autosave_file)
        os.remove(loaded_autosave_file)
        loaded_autosave_file = None

    editorstate.update_current_proxy_paths()
    editorstate.fade_length = -1
    editorstate.transition_length = -1
    editorstate.clear_trim_clip_cache()
    audiomonitoring.init_for_project_load()

    start_autosave()

    if new_project.update_media_lengths_on_load == True:
        projectaction.update_media_lengths()

    gui.editor_window.tline_cursor_manager.set_default_edit_tool()
    editorstate.trim_mode_ripple = False

    updater.set_timeline_height()

    gui.editor_window.window.handler_unblock(window_resize_id)
    if mltplayer.get_sdl_consumer_version() == mltplayer.SDL_1: # TODO: get rid of this
        gui.editor_window.window.handler_unblock(window_state_id)

    global resize_timeout_id
    resize_timeout_id = GLib.timeout_add(500, _do_window_resized_update)

    projectaction.clear_changed_since_last_save_flags()

    # Set scrubbing
    editorstate.player.set_scrubbing(editorpersistance.prefs.audio_scrubbing)
    
def _do_window_resized_update():
    GLib.source_remove(resize_timeout_id)
    updater.window_resized()
    
def change_current_sequence(index):
    edit.do_gui_update = False  # This should not be necessary but we are doing this signal intention that GUI updates are disabled.
    
    stop_autosave()
    editorstate.project.c_seq = editorstate.project.sequences[index]

    # Inits widgets with current sequence data
    init_sequence_gui()
    
    # update resync data
    resync.sequence_changed(editorstate.project.c_seq)

    # Set and display current sequence tractor
    display_current_sequence()
    
    # Editor and modules needs to do some initializing
    init_editor_state()

    # Display current sequence selected in gui.
    gui.sequence_list_view.fill_data_model()
    selection = gui.sequence_list_view.treeview.get_selection()
    selected_index = editorstate.project.sequences.index(editorstate.current_sequence())
    selection.select_path(str(selected_index))

    audiomonitoring.recreate_master_meter_filter_for_new_sequence()
    
    start_autosave()

    updater.set_timeline_height()
    updater.init_tline_view()

def display_current_sequence():
    # On launch we need to set up SDL player differently.
    if _app_init_complete == False:
        return

    # Get shorter alias.
    player = editorstate.player

    player.consumer.stop()
    player.init_for_profile(editorstate.project.profile)
    player.create_sdl_consumer()
    player.set_tracktor_producer(editorstate.current_sequence().tractor)
    player.connect_and_start()
    updater.display_sequence_in_monitor()
    player.seek_frame(0)
    updater.repaint_tline()

# ------------------------------------------------- autosave
def autosave_recovery_dialog():
    dialogs.autosave_recovery_dialog(autosave_dialog_callback, gui.editor_window.window)
    return False

def autosave_dialog_callback(dialog, response):
    dialog.destroy()
    autosave_file = userfolders.get_cache_dir() + AUTOSAVE_DIR + get_autosave_files()[0]
    if response == Gtk.ResponseType.OK:
        global loaded_autosave_file
        loaded_autosave_file = autosave_file
        projectaction.actually_load_project(autosave_file, True, False, True)
    else:
        os.remove(autosave_file)
        start_autosave()

def autosaves_many_recovery_dialog():
    autosaves_file_names = get_autosave_files()
    now = time.time()
    autosaves = []
    for a_file_name in autosaves_file_names:
        autosave_path = userfolders.get_cache_dir() + AUTOSAVE_DIR + a_file_name
        autosave_object = utils.EmptyClass()
        autosave_object.age = now - os.stat(autosave_path).st_mtime
        autosave_object.path = autosave_path
        autosaves.append(autosave_object)
    autosaves = sorted(autosaves, key=lambda autosave_object: autosave_object.age)

    dialogs.autosaves_many_recovery_dialog(autosaves_many_dialog_callback, autosaves, gui.editor_window.window)
    return False

def autosaves_many_dialog_callback(dialog, response, autosaves_view, autosaves):
    if response == Gtk.ResponseType.OK:
        autosave_file = autosaves[autosaves_view.get_selected_indexes_list()[0]].path # Single selection, 1 quaranteed to exist
        print("autosave_file", autosave_file)
        global loaded_autosave_file
        loaded_autosave_file = autosave_file
        dialog.destroy()
        projectaction.actually_load_project(autosave_file, True, False, True)
    else:
        dialog.destroy()
        start_autosave()

def set_instance_autosave_id():
    global instance_autosave_id_str
    instance_autosave_id_str = "_" + hashlib.md5(str(os.urandom(32)).encode('utf-8')).hexdigest()
    
def get_instance_autosave_file():
    return AUTOSAVE_FILE + instance_autosave_id_str

def start_autosave():
    global autosave_timeout_id

    # Aug-2019 - SvdB - AS - Made changes to use the value stored in prefs, with Default=1 minute, rather than hardcoding
    try:
        time_min, desc = editorpersistance.prefs.AUTO_SAVE_OPTS[editorpersistance.prefs.auto_save_delay_value_index]
    except:
        time_min = 1

    autosave_delay_millis = time_min * 60 * 1000

    # Aug-2019 - SvdB - AS - put in code to stop or not start autosave depending on user selection
    if autosave_delay_millis > 0:
        print("Autosave started...")
        autosave_timeout_id = GLib.timeout_add(autosave_delay_millis, do_autosave)
        autosave_file = userfolders.get_cache_dir() + get_instance_autosave_file()
        persistance.save_project(editorstate.PROJECT(), autosave_file)
    else:
        print("Autosave disabled...")
        stop_autosave()

def get_autosave_files():
    autosave_dir = userfolders.get_cache_dir() + AUTOSAVE_DIR
    return os.listdir(autosave_dir)

def stop_autosave():
    global autosave_timeout_id
    if autosave_timeout_id == -1:
        return
    GLib.source_remove(autosave_timeout_id)
    autosave_timeout_id = -1

def do_autosave():
    autosave_file = userfolders.get_cache_dir() + get_instance_autosave_file()
    persistance.save_project(editorstate.PROJECT(), autosave_file)
    return True

# ------------------------------------------------------- disk cache size check
def check_disk_cache_size():
    GLib.source_remove(disk_cache_timeout_id)
    if recovery_in_progress == False:
        diskcachemanagement.check_disk_cache_size()
        projectdatavaultgui.check_vaults_sizes()

# ------------------------------------------------------- userfolders dialogs
def show_user_folders_init_error_dialog(error_msg):
    # not done
    print(error_msg, " user folder XDG init error")
    return False

def xdg_data_dir_changed_dialog():
    if recovery_in_progress == False:
        primary_txt = _("XDG Data folder location has changed!")
        secondary_txt = _("Location of <b>Default XDG Data Store</b> has changed because value of <b>XDG Data Home</b> variable has changed.\n\n") + \
                        _("Existing Projects with project data saved in <b>Default XDG Data Store</b> will continue to work,\n") + \
                        _("but new projects will have data saved in the location specified by the new value <b>XDG Data Home</b> variable .")
        dialogutils.warning_message(primary_txt, secondary_txt, gui.editor_window.window)
    return False

# -------------------------------------------------------- launch tests for imports refactoring testing
def _launch_all():
    gmic.launch_gmic()
    scripttool.launch_scripttool()
    medialinker.display_linker()
    batchrendering.launch_batch_rendering()

    return False

# ------------------------------------------------------- small and multiple screens
# We need a bit more stuff because having multiple monitors can mix up setting draw parameters.
def _set_screen_size_data():
    monitor_data = utilsgtk.get_display_monitors_size_data()
    combined_w, combined_h = utilsgtk.get_combined_monitors_size()
    layout_display_index = editorpersistance.prefs.layout_display_index

    display = Gdk.Display.get_default()
    num_monitors = display.get_n_monitors() # Get number of monitors.

    scr_w = combined_w
    scr_h = combined_h
        
    if layout_display_index == 0:
        print("Using Full Screen size for layout:", scr_w, "x", scr_h)
    elif layout_display_index > len(monitor_data) - 1:
        print("Specified layout monitor not present.")
        print("Using Full Screen size for layout:", scr_w, "x", scr_h)
        editorpersistance.prefs.layout_display_index = 0
    else:
        scr_w, scr_h = monitor_data[layout_display_index]
        if scr_w < 1151 or scr_h < 767:
            print("Selected layout monitor too small.")
            scr_w = combined_w
            scr_h = combined_h
            print("Using Full Screen size for layout:", scr_w, "x", scr_h)
            editorpersistance.prefs.layout_display_index = 0
        else:
            # Selected monitor data is available and monitor is usable as layout monitor.
            print("Using monitor " + str(layout_display_index) + " for layout: " + str(scr_w) + " x " + str(scr_h))
    
    editorstate.SCREEN_WIDTH = scr_w
    editorstate.SCREEN_HEIGHT = scr_h
    
    print("Small height:", editorstate.screen_size_small_height())
    print("Small width:",  editorstate.screen_size_small_width())

    return (scr_w, scr_h)

# Adjust gui parameters for smaller screens.
def _set_draw_params():    

    if editorstate.screen_size_large_height() == True:
        keyframeeditcanvas.GEOMETRY_EDITOR_HEIGHT = 300

    if editorpersistance.prefs.tracks_scale == appconsts.TRACKS_SCALE_DEFAULT:
        return
    elif editorpersistance.prefs.tracks_scale == appconsts.TRACKS_SCALE_DOUBLE:
        appconsts.TRACK_HEIGHT_HIGH = 150
        appconsts.TRACK_HEIGHT_NORMAL = 100 # track height in canvas and column
        appconsts.TRACK_HEIGHT_SMALL = 50 # track height in canvas and column
        appconsts.TLINE_HEIGHT = 520
    else:
        # TRACKS_SCALE_ONE_AND_HALF
        appconsts.TRACK_HEIGHT_HIGH = 113
        appconsts.TRACK_HEIGHT_NORMAL = 75 # track height in canvas and column
        appconsts.TRACK_HEIGHT_SMALL = 37 # track height in canvas and column
        appconsts.TLINE_HEIGHT = 390
                
    sequence.TRACK_HEIGHT_NORMAL = appconsts.TRACK_HEIGHT_NORMAL # track height in canvas and column
    sequence.TRACK_HEIGHT_SMALL = appconsts.TRACK_HEIGHT_SMALL # track height in canvas and column
    sequence.TRACK_HEIGHT_HIGH = appconsts.TRACK_HEIGHT_HIGH
    tlinewidgets.set_tracks_height_consts()

def _too_small_screen_exit():
    global exit_timeout_id
    exit_timeout_id = GLib.timeout_add(200, _show_too_small_info)
    # Launch gtk+ main loop
    Gtk.main()

def _show_too_small_info():
    GLib.source_remove(exit_timeout_id)
    primary_txt = _("Too small screen for this application.")
    scr_w, scr_h = utilsgtk.get_combined_monitors_size()
    secondary_txt = _("Minimum screen dimensions for this application are 1152 x 768.\n") + \
                    _("Your screen dimensions are ") + str(scr_w) + " x " + str(scr_h) + "."
    dialogutils.warning_message_with_callback(primary_txt, secondary_txt, None, False, _early_exit)

def _xdg_error_exit(error_str):
    global exit_timeout_id
    exit_timeout_id = GLib.timeout_add(200, _show_xdg_error_info, error_str)
    # Launch gtk+ main loop
    Gtk.main()

def _show_xdg_error_info(error_str):
    GLib.source_remove(exit_timeout_id)
    primary_txt = _("Cannot launch application because XDG folders init error.")
    secondary_txt = error_str + "."
    dialogutils.warning_message_with_callback(primary_txt, secondary_txt, None, False, _early_exit)

def _too_low_mlt_version_exit():
    global exit_timeout_id
    exit_timeout_id = GLib.timeout_add(200, _show_mlt_version_exit_info)
    # Launch gtk+ main loop
    Gtk.main()

def _show_mlt_version_exit_info():
    primary_txt = _("Flowblade version 2.6 (or later) requires MLT version 6.18 to run")
    secondary_txt = _("Your MLT version is: ") + editorstate.mlt_version + ".\n\n" + _("Install MLT 6.18 or higher to run Flowblade.")
    dialogutils.warning_message_with_callback(primary_txt, secondary_txt, None, False, _early_exit)

def _failed_environment_exit():
    global exit_timeout_id
    exit_timeout_id = GLib.timeout_add(200, _show_failed_environment_info)
    # Launch gtk+ main loop
    Gtk.main()
    
def _show_failed_environment_info():
    GLib.source_remove(exit_timeout_id)
    primary_txt = "Environment detection failed!"
    secondary_txt = "Detecting MLT environment failed and it is not possible to run Flowblade.\nMLT library in your system has not been successfully installed." + \
    "\n\nYour MLT Version is: "+ editorstate.mlt_version + "."

    dialogutils.warning_message_with_callback(primary_txt, secondary_txt, None, False, _early_exit)
    
def _early_exit(dialog, response):
    dialog.destroy()

    _app.quit()

# ------------------------------------------------------- usbhid
def start_usb_hid_input():
    # If USB HID input is enabled, and we have a device config,
    # try to connect to the device now
    if editorpersistance.prefs.usbhid_enabled:
        usbhid_config = editorpersistance.prefs.usbhid_config
        if usbhid_config:
            try:
                usbhid.start_usb_hid_input(usbhid_config)
            except usbhid.UsbHidError as e:
                # Best effort, don't interfere with program startup
                print("Can not connect to USB HID device using driver config '%s': %s" % (usbhid_config, str(e),))

def stop_usb_hid_input():
    # Disconnect from the USB HID device, if necessary
    usbhid.stop_usb_hid_input()

# ------------------------------------------------------- logging
def log_print_output_to_file():
    so = se = open(_log_file, 'w', buffering=1)

    sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', buffering=1)

    os.dup2(so.fileno(), sys.stdout.fileno())
    os.dup2(se.fileno(), sys.stderr.fileno())

# ------------------------------------------------------ shutdown
def shutdown():
    if jobs.get_active_jobs_count() != 0:
        dialogs.active_jobs_info(jobs.get_active_jobs_count())
        return True

    if projectaction.was_edited_since_last_save() == False:
        _shutdown_dialog_callback(None, None, True)
        return True
    else:
        dialogs.exit_confirm_dialog(_shutdown_dialog_callback, get_save_time_msg(), gui.editor_window.window, editorstate.PROJECT().name)
        return True # Signal that event is handled, otherwise it'll destroy window anyway

def get_save_time_msg():
    return projectaction.get_save_time_msg()

def _shutdown_dialog_callback(dialog, response_id, no_dialog_shutdown=False):
    if no_dialog_shutdown == False:
        dialog.destroy()
        if response_id == Gtk.ResponseType.CLOSE:# "Don't Save"
            pass
        elif response_id ==  Gtk.ResponseType.YES:# "Save"
            if editorstate.PROJECT().last_save_path != None:
                persistance.save_project(editorstate.PROJECT(), editorstate.PROJECT().last_save_path)
                projectdatavault.project_saved(editorstate.PROJECT().last_save_path)
            else:
                dialogutils.warning_message(_("Project has not been saved previously"), 
                                        _("Save project with File -> Save As before closing."),
                                        gui.editor_window.window)
                return
        else: # "Cancel"
            return
    else:
        print("Nothing changed since last save.")

    # --- APP SHUT DOWN --- #
    print("Exiting app...")
    # Sep-2018 - SvdB - Stop wave form threads
    for thread_termination in threading.enumerate():
        # We only terminate threads with a 'process', as these are launched
        # by the audiowaveformrenderer
        try:
            thread_termination.process.terminate()
        except:
            None
    
    # No more auto saving
    stop_autosave()
    
    # Save window dimensions on exit
    alloc = gui.editor_window.window.get_allocation()
    x, y, w, h = alloc.x, alloc.y, alloc.width, alloc.height 
    editorpersistance.prefs.exit_allocation = (w, h)
    if gui.editor_window.window2 != None:
        alloc = gui.editor_window.window2.get_allocation()
        pos_x, pos_y = gui.editor_window.window2.get_position()
        editorpersistance.prefs.exit_allocation_window_2 = (alloc.width, alloc.height, pos_x, pos_y)       
    editorpersistance.prefs.app_v_paned_position = gui.editor_window.app_v_paned.get_position()
    editorpersistance.prefs.top_paned_position = gui.editor_window.top_paned.get_position()
    try: # This fails if preference for top row layout changed, we just ignore saving these values then.
        if editorlayout.top_level_project_panel() == True:
            editorpersistance.prefs.mm_paned_position = 200  # This is not used until user sets preference to not have top level project panel
        else:
            editorpersistance.prefs.mm_paned_position = gui.editor_window.mm_paned.get_position()
    except: 
        pass
    editorpersistance.save()

    # Block reconnecting consumer before setting window not visible
    updater.player_refresh_enabled = False
    gui.editor_window.window.set_visible(False)
    if gui.editor_window.window2 != None:
        gui.editor_window.window2.set_visible(False)

    # Close and destroy app when gtk finds time to do it after hiding window
    GLib.idle_add(_app_destroy)

def _app_destroy():
    # Close threads and stop mlt consumers
    editorstate.player.shutdown() # has ticker thread and player threads running
    audiomonitoring.close()

    # Delete autosave file
    try:
        os.remove(userfolders.get_cache_dir() + get_instance_autosave_file())
    except:
        print("Delete autosave file FAILED!")

    # Disconnect from USB HID device (if necessary)
    stop_usb_hid_input()

    # Now that autosave file is deleted, the data folder contents for unsaved
    # projects are unreachable and can be destroyed.
    projectdatavault.delete_unsaved_data_folders()

    # Calling _app.quit() will block if Gio.Application.hold() has been called,
    # and the documentation helpfully says "(Note that you may have called 
    # Gio.Application.hold() indirectly, for example through gtk_application_add_window().)"
    # I'm not calling add_window() on render processes but somehow those call Gio.Application.hold()
    # but I don't know where. 
    #
    # However, those processes complete and exit cleanly and the only problem 
    # is the increased ref count on my _app Gtk.Application object.
    # I have found no other way to exit then calling os._exit(0)
    # and leave cleaning up that may be done in app.quit() not taken care of.
    # I'm calling destroy() on window to get some cleanp-up done there.
    gui.editor_window.window.destroy()
    os._exit(0)
    #_app.quit()

